EVOLUTION
EVIDENCE FOR EVOLUTION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
The ancestors of whales may have been land mammals
|
|
|
Whales could walk if they wanted to
|
|
|
Whales are preparing to evolve into land animals
|
|
|
Someday whales will be able to walk and will have legs
|
Detailed explanation-1: -Looking at a whale’s body and biology, there are plenty of clues that their ancestors lived on land. They breathe air and nurse their young with their own milk, they also have paddle-shaped flippers which encase hand bones with five ‘fingers’. As embryos, whales have tiny back limbs which disappear before birth.
Detailed explanation-2: -Darwin could compare only the anatomy and embryos of living things. Today, scientists can compare their DNA. Similar DNA sequences are the strongest evidence for evolution from a common ancestor.
Detailed explanation-3: -In general, the features of a fossil that most clearly show whether an ancestor of an aquatic mammal lived on land or in the water are those skeletal fea-tures related to breathing, hearing, and locomotion.
Detailed explanation-4: -Their land-dwelling ancestors lived about 50 million years ago. Meet Pakicetus, a goat-sized, four-legged creature that scientists recognise as one of the first cetaceans (the group of marine animals that includes dolphins and whales).